Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65011927887c859…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 12:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03f669cf5909f4a67f3f00ab62d1aa76 SHA-1: 6ea851788666fa6048e49c96a4559d85c0aaf8ca SHA-256: f65011927887c859c78229ad5755be6b64904f26146cc251563e42b72b65d806
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=gta+sa+lite+apk+adreno+download PDF link annotation
    • http://boek.se/bilder_umeny/File/12311103022.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/vusulafomotibikanokemepo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36521335844.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109121414260513468cf3v.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/83652355830.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/1130358986.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/97499683493.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/ludugumokudilatotubodila.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f293215263---41460656184.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/47872164175.pdfIn PDF document text
    • https://terracell.info/images/file/navabalutijenixutezadiwij.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/28111523237.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/numowalubug.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/dokutisakafilisavejat.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lodekebumokakosekisuv.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/40792337670.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78143478438.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906232130.pdfIn PDF document text
    • https://arerp.kr/data/file///97874730255.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/77215086473.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/54310836269.pdfIn PDF document text
    • https://betsin.org/userfiles/files/13149644768.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/jitisivozovabezositen.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/bofokatariv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 18072 bytes
SHA-256: b6f36110a22b125f2085aa81988a0239e8c3a9ae9e6f3db032c7e9d66bd293d2
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 10604 bytes
SHA-256: ad23c56b73e7e2de4f83876cde8bfdd051bac049430a45b19e46c22deeac65ee

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